특징 매칭
Template matching : 단순, 실시간
SAD : Sum of Absolute Differences
SSD : Sum of Squared Differences
NCC : Normalized Cross Correlation
템플릿 매칭
Descriptor : 특징을 설명
rotation : shift됨
SIFT : Scale Invariant Feature Transform
크기무관 특징변환
x : the offset of a discrete point
D(x hat) > 0.03 : remain only
Engineering